As well as being the first person to put forward the hypothesis that time may have a fractal structure, Terence McKenna was the first person to reveal publicly that there is another dimension of reality inhabited by independently-existing intelligent beings who can be contacted by smoking N,N-dimethyltryptamine (DMT) at the required dose level. This means of contact is simple (assuming one can obtain DMT, possession of which is prohibited in most countries), but only a relatively few people have had the inclination or the courage to employ it. Personal contact with this other dimension of reality is sufficient to refute the conventional materialist-scientific view of reality (at least, for a person who has experienced it), but very few academic philosophers, by profession inclined to opine much about the nature of reality, have availed themselves of this opportunity.

Here are some links to web pages where Terence McKenna discusses the use of DMT and other psychedelics to access other dimensions of reality: